Surge Protection Device Manufacturer
Protect your equipment from voltage surges and lightning strikes with certified SPD solutions, ensuring stable operation in industrial, commercial, and residential applications.
- High Safety Standards – IEC certified, tested for surge protection.
- Reliable Performance – Long service life with fast response time.
- Quick Setup – Compact design, user-friendly replacement.
Surge Protection Device Series
Certified products for safe, stable, and efficient power use.
AC Surge Protection Device
Model: STH Series (High Quality)
Model: STM Series (Middle Quality)
Model: STL Series (Standard Quality)
DC Surge Protection Device
Model: DC STD 2P
Model: DC STD 3P
Model: DC STD 4P
Soltree – Trusted Electrical Solutions from China
Work directly with a trusted Chinese manufacturer and save up to 30% vs. local suppliers.
About Soltree
High Quality, Better Price – That’s Soltree
With 15+ years of experience in the electrical industry, Soltree is known for providing high-quality products and reliable service at competitive prices. We are proud to be one of China’s trusted electrical equipment suppliers, with over 100,000㎡ of factory space and 200+ skilled workers.
Supported by strong technical expertise, modern equipment, and strict quality control, we ensure excellence from raw material sourcing to final packaging, maintaining high standards at every step.
Soltree – Reliable Electrical Solutions
Global-Ready, Trusted by Professionals
Soltree delivers reliable smart electrical solutions designed for both residential and commercial use. By combining advanced technology, strict quality control, and efficient production, we provide products that meet international standards while keeping costs competitive. Our goal is to help partners worldwide simplify installation, improve safety, and build smarter energy systems.
Inside Soltree's Workshop
Precision Manufacturing for Surge Protection
At Soltree, every Surge Protective Device (SPD) is built with precision and reliability in mind. From automated assembly to strict quality control, we ensure stable performance and long-lasting protection. Using advanced testing systems, each SPD is verified to meet international standards under real-world surge conditions.
Innovation and Quality that Stand the Test of Time
Our engineering team continuously advances surge protection through research and development. We focus on improving efficiency, durability, and adaptability for diverse environments. With premium materials and smart automation, Soltree delivers high-performance protection solutions trusted by customers worldwide.
- Precision Equipment — Advanced machines ensure accuracy
- Automated Processes — Consistent quality with full automation
- Premium Materials — Stronger performance with high-grade copper
Why Choose Soltree Surge Protection Device
Reliable Protection for Electrical Safety
Certified Safety Standards
All SPDs are tested and certified by IEC / CE / ISO, ensuring reliable protection against surges and lightning strikes.
Proven Reliability
Durable design with fast response time, long service life, and stable performance in demanding electrical applications.
Competitive Pricing
Direct manufacturing supply allows us to offer cost-effective solutions without compromising on quality.
Professional Support
Technical guidance, product customization, and timely after-sales service to support your business needs.
Customization That Builds Your Brand
You can change your logo, packaging, product design, and distributor support to make your business stand out.
Customized Logo & Branding
Custom logos, labels, and product copywriting to strengthen your brand identity.
Customized Packaging Options
Retail boxes, bulk packaging, and private label designs tailored to your sales channels.
Customized Product Design
From new specifications to complete ODM projects, we bring your product ideas to life.
Customized Distributor Materials
Customized brochures, manuals, and marketing assets to support your sales network.
Frequently Asked Questions
Here are some typical questions. If yours isn’t on this list, please call customer care.
How can I get a quote for the surge protection device
Please contact our customer service for a quote on our surge protection device. We’re available 24/7. Provide your order details (type, size, quantity), and we’ll assist you through the entire process.
What is your MOQ for the order?
Our minimum order quantity (MOQ) is modest. You can purchase as few as one unit, and we will deliver it just how you want it.
How long will it take for my order to arrive?
Our surge protection device is ready in 7–10 business days, with delivery taking up to 15 additional days. For custom or bulk orders, we’ll confirm the turnaround time before you place your order.
Can I get a sample before I place my order?
Yes, we provide samples for evaluation and approval. Contact our customer service team to get a sample.
Can you make customized surge protection device
Yes, we do make custom surge protection devices. Tell us what you need, and our knowledgeable customer service team will help you through the design process.
How is your after-sales service?
We offer 24/7 after-sales support. Our technical team can help with installation or operation issues, and defective items are covered by repair, replacement, or refund under our warranty policy.
Table of contents
- 1. What Is a Surge Protection Device(SPD)?
- 2. Key Features of Surge Protection Device
- 3. Always Know Your Protection Status
- 4. Flame-Retardant Material for Safer Protection
- 5. Ultra-Fast Response for Lightning Protection
- 6. Compare Our Surge Protection Device Models
- 7. What Makes One Surge Protection Devices Safer Than Another?
- 8. Know more about SPD
1. What Is a Surge Protection Device(SPD)?
Lightning strikes, power grid fluctuations, and line faults are common in power systems, and they can generate instantaneous high-voltage surges that may damage equipment or even cause fires.
Reliable Surge Protection For Safer Power Systems
SPD — Stops danger at the entry, protecting your electrical safety.
Power surges are sudden spikes in voltage that can damage sensitive electronics, disrupt operations, and even cause safety hazards. A Surge Protection Device (SPD) works by instantly detecting abnormal voltage and diverting the excess energy safely into the ground, preventing it from reaching connected equipment. Simple to install yet highly effective, SPDs are essential guardians for both homes and businesses, ensuring reliable power and long-term protection.
2. Key Features of Surge Protection Device
Surge Protection Device (SPD) safeguards electrical systems by preventing sudden voltage spikes from damaging equipment. They ensure safer, more reliable power for homes, offices, and industries. Below are six key features that make Soltree SPD an essential part of modern electrical protection.
- Surge Protection:
Responds within nanoseconds to instantly block harmful voltage surges.
- Flame-retardant Housing:
Built with fire-resistant materials to enhance safety and reliability.
- DIN Rail Mounting:
Quick and convenient installation with globally compatible DIN rail standards
- Modular Design:
Flexible structure allows convenient replacement and maintenance.
- Multiple Protection:
Provides comprehensive defense against lightning, overvoltage, and transient surges.
- Strong Endurance
Durable construction ensures long-lasting performance under harsh conditions.
3. Always Know Your Protection Status
Traditional surge protection device lack a status window, making it impossible to know when the device is damaged and needs replacement. The new SPD comes with a built-in indicator window, offering a clear and intuitive way to check its working condition.
Clear Status, Instant Reminder
The visual indicator makes system monitoring simple and efficient. A green display means the device is functioning properly, while a red signal clearly alerts you when the module should be replaced. This easy-to-read design helps you act quickly, preventing hidden risks and keeping your power system secure.
By giving you a clear view of the device’s health at all times, the indicator window adds peace of mind and ensures your protection is never left to guesswork.
4. Flame-Retardant Material for Safer Protection
During lightning strikes, the high voltage and current may break through the surge protector and generate sparks. Without flame-retardant materials, the consequences could be disastrous.
Enhanced Safety with Fire-Resistant Design
The flame-retardant enclosure not only strengthens the durability of the device but also provides an added layer of protection in extreme conditions. By effectively reducing the chance of fire spread, it helps secure your power network and safeguards both residential and industrial applications.
Beyond fire resistance, the use of high-quality materials ensures long-term stability and reliability even under repeated surge events. This added assurance means your system remains protected day after day, giving you confidence in both performance and safety.
5. Ultra-Fast Response for Lightning Protection
When facing lightning strikes or other sudden surges, the response speed of a surge protector is critical—only a fast enough reaction can truly safeguard your electrical safety.
Nanosecond-Level Protection You Can Trust
When lightning strikes, every microsecond counts. Soltree SPDs use advanced components to deliver ultra-fast response—measured in nanoseconds—to block harmful surges before they reach your equipment.
Built for reliability, our surge protection ensures stable performance in homes, commercial sites, and industrial systems—keeping power secure and devices running without interruption.
6. Compare Our Surge Protection Device Models
From standard safety to premium performance, Soltree surge protectors deliver the right solution for every need—ensuring your power system is always secure.
| Item / Feature | STL (Standard) AC | STM (Middle) AC | ⭐ STH (High) AC | ⭐ STD (DC) |
|---|---|---|---|---|
| Modular Design | Standard Version | Standard Version | Upgraded pull-out design with heat dissipation | Upgraded pull-out design with heat dissipation |
| Chip Quality | Regular Version | Regular Version | Upgraded Version | Upgraded Version |
| Chip Encapsulation | OBO Type | OBO Type | Shield Type, Independent Chip Encapsulation | Shield Type, Independent Chip Encapsulation |
| Mounting Base | Standard Version | Standard Version | New Version, More Durable | New Version, More Durable |
| Socket Connection | Iron Parts | Iron Parts | High-Quality Copper Parts | High-Quality Copper Parts |
| Tripping Mechanism | Standard Version | Pull Handle, Faster | Top push-trip mechanism, Faster Response | Top push-trip mechanism, Faster Response |
| Chip Pin Connection | Copper Parts | High-Quality Copper | High-Quality Copper | High-Quality Copper |
7. What Makes One Surge Protection Devices Safer Than Another?
The Internal Structure Matters—What’s Different Inside Our Three Surge Protection Devices?
- Poorest quality
Cheap surge protectors often skip proper epoxy encapsulation, leaving MOV chips exposed to moisture and failure. Without a reliable tripping system, they can’t react in time during lightning strikes — putting your equipment at risk.
- STL Series SPD
Soltree’s standard SPD uses epoxy encapsulation and a dependable tripping mechanism to ensure safe disconnection during surges.
- STM Series SPD
Upgraded version with enhanced copper connections for faster response and greater precision in surge protection.
- STH/STD Series SPD
Premium models featuring fully encapsulated MOV chips and high-grade copper parts for maximum durability, heat resistance, and top-tier safety.
8. Know more about SPD
Learn more about Surge Protective Devices (SPDs)
1.Surge protective device (SPD) working principle
A Surge Protective Device (SPD) safeguards circuits from transient overvoltages. When a voltage spike occurs, the SPD quickly switches to a low-impedance state, diverting excess current safely to the ground. Once the surge passes, it returns to a high-impedance state, maintaining normal operation and protecting connected equipment.
2.Main types of SPD
| Type | Installation Location | Main Function | Test Standard / Waveform |
|---|---|---|---|
| Type 1 SPD | Main distribution board or building service entrance | Discharges high-energy surges from direct lightning strikes | 10/350 µs impulse current |
| Type 2 SPD | Sub-distribution panels inside the building | Protects systems from switching surges and indirect lightning effects | 8/20 µs discharge current |
| Type 3 SPD | Near sensitive equipment (sockets, plug strips, devices) | Fine protection against residual surges from Type 1 & 2 | Combined 1.2/50 µs voltage + 8/20 µs current |
| Type 1+2 SPD | Compact or hybrid installations | Combines Type 1 & 2 protection for full coverage | Withstands direct lightning and switching surges |
3.Specifications of SPD
Uc — Maximum continuous voltage the SPD can withstand without degradation.
Up — Residual voltage that appears during surge discharge, showing the real protection level.
In — Standard discharge current the SPD can repeatedly handle, representing long-term durability.
Imax — Maximum surge current the device can withstand once, showing its peak capacity.
8/20 µs — Standard test waveform for switching surges and indirect lightning effects.
10/350 µs — High-energy lightning impulse waveform used for Type 1 SPDs, simulating direct lightning strikes.
What Our Customers Say
Trusted by global clients in residential, commercial, and industrial sectors.
Get Free Samples
Have questions about our products or need assistance with a project? Our team is ready to help you find the perfect electrical solution.
Mail Address
jacky@cnsoltree.com
Phone/Whatsapp
+86 15658672325
Headquarters
Fenghuang Industrial Zone,BaishiTown,Yueqing Zhejiang P.R. China
Contact Us
